DITTOI'm not sure how your float valves work but the ones I have are double acting with a detent (float) position. They will hold a cylinder position or allow it to float depending on which position you choose. They work like a FEL control valve. power up, power down and float.
They give you both functions and can be used as a valve without a float position.
Some implements such as hay cutters follow the couture of the ground better if control lever is placed in float position. Float is also utilized on front end loader boom hyd circuits to a limited degree.bdhs that’s exactly how mine work. That’s why I was questioning why anyone wouldn’t want that extra float detent position?